Never be ashamed of losing. No general can win every battle.
In some ways, this is an opportunity!Right now, we have everything to gain, while those in the fortress can only lose.
Player: "I take it you have a plan?"

To re-take Kysis Fortress? Yes, but I could use your help.
Gather your friends and attack the Kysis Fortress Garrison. Harass them, and keep it up. I want them frustrated, tired and off-balance.Once you wear them down, we will launch our main assault. Do you have enough allies to do that?
Player: Accept.

I'm glad to have your help. I hear your companions are similarly effective.
Go run them ragged, but retreat immediately if the odds turn against you. This isn't worth your life.May the shadows protect you!
Player: "Shadow keep us all!"

How goes it? I'd hoped you would have a report by now.
I need those garrison troops softened up.
Player: "We've bloodied them."

Well done!Now I can move in my main force.Here. I apologize, you deserve a more valuable reward, but my troops await...