6/6 is actually the farm space limit you can send to a specific player while the limit of troops you can send is basically 5 (no farm space limit)
That means you can send 5 troops regardless of their troop space capacity.
If the limit of the space is 6 you can only send: Alliance Gate lvl2
- 5 warriors
- 5 archers
- 1 horseman
- 2 horsearcher
- 3 warriors + 1 horsearcher
- 3 archer + 1 horsearcher
If the limit of the space is 9 you can only send: Alliance Gate lvl3
- 5 warriors
- 5 archers
- 3 horsearcher
- 3 warriors/archer + 1 horseman
- 3 warriors/archer + 2 horsearcher