Titans, similar to battlefield 1's behemoths, is a super vehicle that is deployed to assist the opposing team, there can be map variants for the titans to trigger or not. The losing team, often in conquest mode, are bound early on to lose if the enemies manage to capture the points and evenly guard them, so what other way is there to provoke fear and panic? Nuclear warfare? Too many tax payer dollars and collateral! That's all I got, send in the titan! Certain maps can trigger a certain behemoth type! For example: island maps can trigger a battleship-type titan, desert maps could have giant battle planes such as AC-130's, and tunnels in particular could trigger an experimental armored train that shoves debris out of the way! (I forgot if that map even had train tracks or not). I'd recommend the titans being Map parts that "magically" work on their own instead of player controlled, it'd be too complicated to add stuff like that to the tutorial.

Second suggestion,