Martins couldn't bring sufficient troops due to objective reasons.
The Calamity Fleet is vast in scale, and currently, a large number of human warships are still on their way to support, which will take at least several days to arrive gradually. Before that, the Human Fleet is not strong enough to compete with the Calamity Fleet for the remaining orbital regions of the planets.
The location of the church is naturally underneath the orbital space controlled by the Calamity Fleet, belonging to the other side of the Human Fleet.
It's entirely normal.
If their target is the coffin in the crypt below the church, then when occupying Papalier's orbital space, they would naturally choose to control a specific area of space. However, humans did not know their target beforehand and didn't compete for it, and at this moment, there's even less chance to compete for it.
When the Chaos Army supplements ground forces, it's very convenient; they just need to directly air-drop.
