Push the front line with your squad and tank escort. Capture their base before they capture yours.
Doodle Trench is a top-down team shooter that measures success by territory, not kill count. You move your squad forward alongside a tank escort to push the front line toward the enemy base, while the enemy squad is trying to do the exact same thing back toward yours -- so a match is really a tug-of-war over the ground between two bases rather than a race to rack up the most eliminations.
That objective focus is what sets it apart from Doodle Warz and Doodle Strike, RivalPit's other top-down shooters -- both of those are about individual kills (deathmatch, gun-game progression, or wave survival), while Doodle Trench rewards coordinated pushing and defending even from a player who isn't winning every individual gunfight. A squad that manages the tank escort and holds ground well can out-push a squad that's simply better shots but pushes recklessly.
Don't outrun your tank escort chasing a kill -- a squad member caught alone ahead of the tank and the rest of the squad is usually an easy pick-off, and losing that fight can cost you more ground than the kill would have gained. When the front line is contested and neither side is clearly winning, it's often better to hold your current position and let the enemy overextend into your squad's fire than to force a push before you have the numbers advantage.
By capturing the enemy base -- kills matter only insofar as they help you push the front line, but the win condition is capturing their base before they capture yours, which makes positioning and pushing as a squad more important than a high kill count.
The tank moves with your squad as you push toward the enemy base, adding firepower to your advance -- it's a core part of pushing the front line, not a side objective, so protecting it while it protects you matters.
Warz and Strike are both about individual combat -- deathmatch/gun-game progression and wave survival respectively -- while Doodle Trench is objective-based: you're pushing and defending territory with a squad and tank escort rather than chasing kills for their own sake.