Iron Sky: Invasion

Story related and cannot be missed. Chapter: 1.

The Biterolf is the first capital warship you’ll encounter. The capital warships of the game look like huge Zeppelins. The most effective way to take them down is to try and destroy their engines first, then cannons, whilst taking out the Walkyr ships that protect them. Once you have killed a few of the Walkyrs, the Zeppelin will open hangar doors to spawn more - this point of the ship is their main weakness, unload all the ammo you can into the hangars to make a good dent in their HP. Rinse and repeat until you have destroyed the warship.

Bear in mind that you can open up your map with  and fast travel to a nearby space station to autosave your progress, fill up on ammo, and then return to the battle at the point where you left.