How about upgrading the current troops into a new set of troops through the training academy
Upgradable to level 5 Troop allocation levels unlockable are as follows...
Level 16 unlocks Fiskars
Level 18 unlocks Blowgunners
Level 24 unlocks Knights
Level 28 unlocks Charioteers
Level 30 unlocks Whipmasters
Level 32 unlocks Spearmen
Level 38 unlocks Scorpions
Level 44 unlocks Pikemen
Level 50 unlocks Petards
Your troops get sent in and get trained to become stronger, faster and harder to kill
send your troops to the academy where they use half the amount of time to upgrade as they do to make using the corresponding materials to upgrade them
1 Recruit + 250 tools + 1 hardwood to make 1 Fiskar the elite axe thrower
1 Archer + 10 tools + 50 pinewood planks to make 1 Hidden Blowgunners
1 Militia + 30 steel + 20 tools to make 1 Knight
1 Cavalry + 10 carts + 10 tools + 5 steel to make 1 Charioteer
1 Longbow + 5 Scarecrows + 6 tools to make 1 Whipmaster
1 Soldiers + 20 iron ore + 15 Hardwood planks to make 1 Spearman
1 Crossbowmen + 1 cart + 250 bows to make 1 Scorpion
1 Elite Soldiers + 2 steel + 10 hardwood logs to make 1 Pikemen
1 Cannoneers + 11 Barrels + 1 Saltpeter to make 1 Petard
Upgraded Hit Points Damage Accuracy % inititive
Fiskars 44 17 – 33 88 normal
Blowgunners 11 22 – 44 88 normal
Knights 66 22 – 44 88 normal
Charioteers 10 8 – 14 88 first strike
Whipmasters 15 35 – 70 88 normal
Spearmen 99 22 – 44 99 normal
Scorpions 11 50 – 100 88 first strike
Pikemen 132 30 – 60 95 normal
Petards 66 80 – 150 98 first strike