This is indeed a problem: 44 divisions, millions of soldiers, to learn to use hand grenades in a short time.
Although using hand grenades is quite simple, in principle, you just need to pull the fuse and throw it.
But without a strict usage protocol on the battlefield, deploying millions of hand grenades to millions of soldiers at once would inevitably cause more accidents.
Shire suggested a feasible plan: "We can convert tank unit soldiers into instructors. As long as we send them to the front line to train the troops, they can quickly teach them how to use hand grenades!"
Colonel Brownie's unit has more than a thousand men. They've undergone grenade throwing training and even have combat experience; they can be dispersed to the front lines to train different units.
But this plan was quickly rejected by Gallieni.
"How long have they trained?" Gallieni asked leisurely.
"Two weeks, General!" Shire stood up and replied.