Originally posted by NUTCRACKER:

any way to find out how strong is the opponents unit or the city?
I have to make blind attacks?

As soon as you have your army close to an enemy unit (on an adjacent tile), the information about the attack power is revealed but you don't see anything else (like health, unit improvements, loyalty, etc.). All these information are revealed after the first attack on that unit that turn.
Nevertheless, you have available all the information from your side (your withdrawal chance in case of fail, your attack terrain bonus, your terrain bonus in case of advance, your army morale, etc.) and static information about an enemy (like his terrain defense bonus on that tile). All this is available in tooltip before attack.
On top of that, there is the "Commander's advice" which wraps up all these information and partially adds to the calculation also the unknown information.

If your question is if there is a generic way how to see all the details about a unit before first attack, the answer is no.
There are three ways how this can happen in game:

1. You attack that unit the same turn. For the next attack (during the same turn), you will already have all the details available.
   
2. You cancelled a treaty (allowing you to see the details of your ally) and declared war the very same turn. For that particular turn you will have details of all the enemy units available.
   
3. Detailed unit information are revealed as a result of state decision or objective fulfillment.

ok problem:, when I attacked a settlement...and lost the full 10.000 army men...
only why I did not know that the city lvl 2 has 50k inhabitants?!
as I can not siege the city. a general can do something yes.
or
with 3 armies I attack one enemy. sometimes win, lost or draw. and I can not explain why this happens. the bonus stats (area bonus) are usually the same on both sides (almost)

then it needs a rework.

Originally posted by NUTCRACKER:

ok problem:, when I attacked a settlement...and lost the full 10.000 army men...
only why I did not know that the city lvl 2 has 50k inhabitants?!

The number of inhabitants is not important since it is just a derived number from city size. What matters is the city size which can be seen directly on the city label (the "size bonus" is based on the size of a city).

Originally posted by NUTCRACKER:

as I can not siege the city. a general can do something yes.

I am not really sure what do you mean by this.

Originally posted by NUTCRACKER:

with 3 armies I attack one enemy. sometimes win, lost or draw. and I can not explain why this happens. the bonus stats (area bonus) are usually the same on both sides (almost)

The battle result is not something you can calculate in advance. It is not a spreadsheet or a simple formula. If you reload a save file and for the same attack you sometimes win, sometimes lose or it is draw, it usually means that the armies were quite equal in power and hence the actual result can vary.
You should be able to find out all the aspects taken into consideration for particular battle from the battle window (displayed after a battle). There is 11 or 12 aspects taken into consideration (starting with the terrain bonuses, general morale, loyalty, experience, army morale, improvements, size bonus, etc.).

I have played now this and 15 hours Imperiums Greek Wars.

There is missing a lot. informations about your own units.
the strength and attack / def power is totally strange. I can have full attack but only 10% of my men?
also, to get this information is complicated. why not a small info at the units screen right bottom?
about cities... this is horrible. it are blind attacks... why?

beside this, I hav had garrisoned 2 units (peltast + hoplit) in a city with extra defense. and athens hoplit attacked only the city (no unit appeared) and did win?! conquered the city.

I have never lost so many units in a game since I played civilisation in 1991 (and there was instant kills of units, mostly).
ok, in Imperiums Greek Wars I have a note by the General, what helps.
but there were results.. like this:
defeat, both sides lost 50-60 men?! from 500-1000 each side

ps
there is also missing any note about production of the fields or the cities. this was 35 years ago yet in civ1. so idont know which field give me how much food or wood... make it sense to make a field or limber jack it all.. however, there is much air on top.

Originally posted by NUTCRACKER:

the strength and attack / def power is totally strange. I can have full attack but only 10% of my men?

The defense (it is actually called health) is how many soldiers are alive. The attack power is their ability to make any harm to an enemy.
When you have only 10% health but still high attack power, you can imagine it like last 300 hoplites in Thermopylae. It was just a fraction of the army yet with high ability to cause damage. Such example is quite rare though and pretty much only theoretical.
I cannot recall any testing where I ended up with 100% attack and only 10% health. 10% health is literally at the edge of the death since hoplite has base health 5 and 10% is 0.5 which is the lowest possible value it can have and yet being alive.

Originally posted by NUTCRACKER:

also, to get this information is complicated. why not a small info at the units screen right bottom?

I am not sure what do you mean by that. Whenever you select a unit. a Unit Menu is displayed in the bottom right corner with all the information displayed (attack, health, action points, loyalty, morale, improvements, state, experience...).

Originally posted by NUTCRACKER:

about cities... this is horrible. it are blind attacks... why?

A city has always the same "defense" (which is 2) multiplied by terrain bonuses, city size bonus, improvements and garrison units. The bigger the city, the higher the size bonus. What is blind on that? You can see the improvements (palisade, stockade or city walls), you can also see the health. The terrain bonus is known (since it is a static information).
The only thing you don't know before first attack is if there are any garrison units and how strong they are.

Originally posted by NUTCRACKER:

beside this, I hav had garrisoned 2 units (peltast + hoplit) in a city with extra defense. and athens hoplit attacked only the city (no unit appeared) and did win?! conquered the city.

It seems like your units were either improving or being repaired OR you were out of food or soldiers' pay. Could this be something you were going through? It is hard to say what exactly it was without seeing the situation but if a garrison unit is active, it always defends the city.

Originally posted by NUTCRACKER:

I have never lost so many units in a game since I played civilisation in 1991 (and there was instant kills of units, mostly).

I am really not sure what is happening in your game, but losing a unit in the game is quite rare or at least not frequent. You either go to suicidal battles or you are missing something (are you sure you have enough gold to pay the soldiers, enough food to feed them, you have supply lines reaching your units?). If you lost so many units there definitely is something.
Are you sure that there are no warnings about any of the potential causes mentioned above?

Originally posted by NUTCRACKER:

ok, in Imperiums Greek Wars I have a note by the General, what helps.

I am not sure I understand what you mean by this. Are you refering to "General's advice"? This is available in boths game, not just Aggressors. Or do you mean something else?

Originally posted by NUTCRACKER:

but there were results.. like this:
defeat, both sides lost 50-60 men?! from 500-1000 each side

Indeed. The battles are not always decisive, especially in ancient times. Sometimes even a strange sign could force commanders to postpone a battle or withdraw from the battlefield. Battles are not spreadsheets.

Originally posted by NUTCRACKER:

there is also missing any note about production of the fields or the cities.

You can simply select a city and once the city is selected you can hover over a particular field. This will give you the exact information of the production of that particular tile.
For bigger picture, you can always go to Resource usage window (click on particular resource in the resource panel) and it will show you the the overview map where you can hover over every tile and see the exact production and consumption.