Well, we played the mission silently, without alerting the enemy until the sniper shot.
It's weird that the Panzers didn't attack you. Usually if we alert the enemy, the enemy
mounts the tanks and they attack you. You don't get to approach the tents without begin
met by one of the Panzers if you start shooting like you did.
I figured out after like a hell of attempts that you could shots certain enemies in first spawn range without alerting the panzer blitzkrieg. If I would even shot on bad spot from beginning I am then sure, they will come to me. Like a sniper dude on main building, he can be seen from beginning, If I shot there, near him or hit him, its blitzkrieg time. In nearby to tents shooting is certain death + loud shooting immediately triggers the enemy at closer area and alert a all tanks, indeed.