Strategy for insane difficulty :

2 artillery + upgrade -> 3 tank + 1 spider

in early

Attack with :
2 tank for take xp bonus.

Defense with :
Artillery deploy (press Z)
for cover Artillery
1 tank + spider (anti air)

Strategy :
Xp Artillery + tank maximum

just camp and kill the ennemy with 3 tank

3 artillery deploy + 1 spider

creat 1 buggy and capture 3 flag

More Guide / Steam Deck Performance Here ! : https://gtm.steamproxy.vip/profiles/76561197987755126/myworkshopfiles/?section=guides