armies

In a scenario where the Belle Epoque lasts 25 more years with the Great War starting on September 1, 1939, how do armies develop? What would the armies look like with a further 25 years to hone their technology and tactics without the Great War? Would army technology be ahead or behind OTL?

Hi everybody. In my ATL around 250 BC, Greeks invented crossbows as an upgrade from gastraphetes. So i am curious what would be the affect of crossbow in this era OTL armies. Would this lead to new battle tactics and formations( for example Ptolemaic Eypt army,Rome)? Looking forward to hear your...