You could make terms of war and surrender.
E.g Winner will take 500k rss or their capital tools or exchange levels of capitals.
winner will get 1 pantheon..etc etc
And the looser could loose a pan, loose an achievement or influence points.
One of the problems with Sparta is that you cannot really "win" and there is no core purpose in the wars. The prize is not worth the cost at all.
Plarium sits at difficult crossroads:
On one hand you have money players who build up their city and armies as a project and could quit if defeated and downgraded.
On the other hand you have money players (like me) who want SWOE to be a true strategy game with real winners and losers and could quit if you insist on making it a nice "nobody loses" kind of game.
At this time I see war in SWOE as a way to wipe out a bunch of units without hope of gaining anything significant and the downside of having to pay Plarium a bunch of Drachmas to revive all the dead units. There is no "War" in SWOE