Second, the stirrup. Made cavalry much more effective. Since horses are harder to put on ships than infantry, did this also reduce the scope for maritime empires, at least maritime empires that extended their reach inland? 7 | Paul Krugman (@paulkrugman)

Second, the stirrup. Made cavalry much more effective. Since horses are harder to put on ships than infantry, did this also reduce the scope for maritime empires, at least maritime empires that extended their reach inland? 7/ https://t.co/1usOoRPD61

— Paul Krugman (@paulkrugman) 25 de agosto de 2018