Greetings, (this is my first post)
I recently wiped out the fleet of my arch enemy, the Nebronian Theocracy, and decided to invade their homeworld, a perfectly suitable earth-like world that would be a crown jewel of my empire. I used my fleet to wipe out their ground units and brought in the 15 heavy assualt battalions and the 10 marine battalions I had loaded on my 3 assault transports and ordered them to combat drop on the planet. I waited a bit and... "Cannot combat drop ground unit as target is not a population". Whaaa? Maybe it's because I had the planet selected, instead of the population contact. So I tried again, this time selecting the EM and Thermal Contact coming from the planet labeled "Population [Neb]". Except, the only option I could do was "Boarding Action". Anyone know what I'm doing wrong here? This invasion is the culmnination of a 15 year interstellar war and I really want the planet instead of glassing it.
You need to add one of your populations (colonies) to their world, then offload the troops to your colony, then you can go to the Ground Units tab and attack their colony from your colony.
To add a colony, go to the System (F9) screen, select the body in question, and hit the "add colony" button at the bottom.
John
PS - Please post new user questions in The Academy. There's a "Where to post" FAQ in the FAQ board that might be helpful in getting a feel for where things go. Thanks!