Cap'n Kobold
Hero
At level 5 you could grant the ability to make an attack in addition to using a maneuver that would usually take their action (which might involve also making an attack).The warlord does need something at level 11 to keep pace with other classes. All classes get something at levels 5 and 11 to help with combat. For a warlord I'd definitely give them extra attack at level 5. Level 11 a class gets either something like a damage bonus (improved divine smite, extra attack) or a defensive buff (like the barbarian and, I think, the monk gets though I can't recall what they're called).
Have some features like Help action at range that can be substituted for an attack, so the class can always contribute without having to make an attack. (Or make that specific to 'lazylord'/'princess' build.)
At level 11 allow the warlord to use two maneuvers as their action.
(I'm using maneuver here as an interim name for a marshal ability, whether at-will, or resource-spend.)