Where should I keep my soldiers?
I’ve already discussed the issues with food production. Next up, is where to keep your soldiers. Remember, there are two types of soldiers: defensive soldiers (greens) and attacking soldiers (blues). And you generally want to follow the 80/20 rule.
Keep only green defensive troops in your main castle. Let me repeat that. Keep only defense troops in your main castle.
The general unwritten rule in Empire: Four Kingdoms, is that you only attack castles (unless you are starting a war, or actively in a war). This means that attackers will leave your outposts (ops) alone. This makes them a great place to hide your attacking troops.
If you have more than one outpost, you have some choices. I tend to keep one outpost full of just attacking troops. Use these troops to raid RBCs (robber baron castles), inactive and active players. I fill all the rest of my ops with defensive troops. I can then use these to support my alliance members, or support myself.