Did you play the 4 hour session all the way through without loading in between at any point? I'm still not sure if it can change things dramatically if you quit and load the game, at least I felt the troop count was fine in your savegame. It took me around 35 minutes to complete the map from where you were.
Your general faction capacity is already taking some penalty for completing the game as far as you've done, it is to make it a bit harder while your own squad grows in size and you have more power through calls, rare weapons, vehicles.
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Ok, here's my take on the battle, with big ass pictures.
First thing I noticed you had no RP. Not sure if you're familiar with the concept but RP gets you radio calls among other things.
The enemy managed to capture North Trench in my game for a minute, seemed like some enemy wanderer troops as they bypassed the South Trench which we still held. We got North back, then started attacking East Camp.
As the area is very open, my strategy was to place sandbag barriers for cover here and there, I found some of those valuable items which I went to drop by the armory to get some RP for the cover resources.
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The lucky break happened when the enemy dropped a Lona Misa, but kept guarding it (ok they don't really do that, but happened to stay on it anyway).
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I carefully pushed forwards a little, got the painting, and fled the place to drop the painting at the armory.
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Got 500 RP and made plenty of calls available.
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I kept pushing at East Camp, using an 8-man paratrooper drop, and the tank had also arrived to the spot. You can see the exact positions of friendly troops rather then just numbers and whether they are offensive or defensive (darker green) in debugmode, it'll probably end up in the actual game once it's made to look right.
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We captured East Camp after a while and started storming East Base. Attackers kept flowing from all our bases in random pace, the tank especially seemed to take quite long to travel from the other side of the map, but it got to the attack area anyway, several times even.
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We almost had it entering from front, but not quite. Eventually I ran back to the armory to pick up an MP5SD and a few C4, entered the base from back while AI created a suitable distraction at the front entrance, luring most of the tower defenders away from the tower.
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Easy victory from that point on, had the RP for a few 8-man drops, one would've been enough actually.
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