Grenadiers and Tanks
These guys like to go at it from long range. Grenadiers cause massive damage but are inaccurate, and if you’re not careful the grenades they throw can damage your own troops. Not so with Tanks, which fire from a far enough range that they avoid the grenades. A good attack plan is to have an even number of landing craft for both your Grenadiers and Tanks. To inflict more damage, tip the balance in the favor of Grenadiers. To last longer in battle and absorb more damage, tip the balance towards your tanks. Optional: fill one landing craft with Medics to keep everyone healthy.