Trench + Spoils Question

Scenario:
Territories all in a line, and only touch the one on either side.
A - B - C - D - E etc
I'm on A. I have 4 spoils. Normal trench I can attk from A to B. if B is player 2 last territory, and I kill him and earn 1 spoil I now have 5 and am forced to trade mid turn.
IF I drop those spoils (let's say FR rainbow = 10 troops) on B - can I use those 10 troops that haven't attacked / advanced anywhere to hit territory C now? Or is it locked by territory and not necessarily those troops?
Thanks,
IcePack
Territories all in a line, and only touch the one on either side.
A - B - C - D - E etc
I'm on A. I have 4 spoils. Normal trench I can attk from A to B. if B is player 2 last territory, and I kill him and earn 1 spoil I now have 5 and am forced to trade mid turn.
IF I drop those spoils (let's say FR rainbow = 10 troops) on B - can I use those 10 troops that haven't attacked / advanced anywhere to hit territory C now? Or is it locked by territory and not necessarily those troops?
Thanks,
IcePack