History Line: 1914-1918/Atlas

"Please hold the line"

That sums it up pretty well. A messy and quick assault of the enemy, but you have plenty of gunnery to repel it. For me, the hardest part was getting rid of the enemy's planes. They all concentrated on the area around your far NW depot, where there is little AA defense. By the time my planes arrived, his were already experienced and dangerous.

Build a heavy artillery asap in your NE factory, together with a transport car. Once the initial assault is repelled, start taking depots and factories to change the resource count in your favour. The rest is easy, but takes a while.