Rams and catapults
Rams hit the wall. Catapults hit a building you pick — or a random one. Both are workshop units and both are slow. On a windowed server that slowness is a plan, not a nuisance.
Rams
The wall’s defence bonus dies with the wall. City Wall (Romans) is the toughest, then Palisade, then Earth Wall. A conquest wave that leaves the wall up is wasting chiefs.
Catapults
This world shows catapult targets in the send UI. Aim the Palace or Residence first if you want the village. Aim resource fields if you want to starve it. If population hits 0 the village is destroyed, not conquered. Gray tile. No owner change. Do not do that on a village you wanted.
Travel
Workshop units walk at 3–4 fields/hour before troop speed. At 10x that is still a long walk across a 25×25. Send them in the evening to land in the morning, or accept that a siege is a two-session project. Use the travel calculator.