For some reason Steam is not cooperating well with image upload. So I will provide them at the below link for easier download. Resolution should be enough for drawing simple tactics as per your request.

Map Images[onedrive.live.com]

For more info about the battles you can read the Tactics Guide.

At the following section you can view and get the images one by one:

The armies approach Gettysburg

Battle of McPherson Ridge

Chance to Change History

The Battle of Devil's Den

The Union attacks Benner's Hill

Conquer the map

Fight for two hills

The Confederates counter attack Seminary Ridge

Meeting at Cemetery Ridge

Pickett's charge

The Round Top Hills attacked from the south

What if Buford had not held McPherson Ridge

Ewell advances

Night assault

Union on the offensive

Defensive line along Warfield Ridge

Corner your opponent

Night battle on the Round Tops