Shovak bulldozer

Shovak bulldozer is a ground enemy that will crush anything in it's path with its war plow, the appearance is notice by a short arrow pointing before it's coming.

Strategy
When it appears, instantly focus your fire onto it. This will make it back away from your tank for some time while you shoot down any planes or dodge any projectiles coming your way. If you touch it, it's an instant death, even with shields. Once you're clear, destroy the dozer. Once done, stay in the middle of the screen to make sure no bulldozers catch you by surprise.