once, during a tornament at the local gaming shop, my frind drew a mission where his opponent was deployed to the center of the board, and had to get as many people off both small edges as they could. unfortunatly for them, my friend plays a new IG army, he simply lined his squads of guardsmen with each model exactly 2 inchies from eachother, and was able to fill both small edges entirely! if his opponent wanted to exit through a side, he had to go through his entire army. my friend then proceeded to sit back a shoot apart his opponents army.