I also heard of that. Japanese government asked people to donate,,, had sword making skill then donating skill, no skill but having family sword then donating sword, no skill no sword but having money then buying swords to donate,,, basically, everyone had a role to play at wartime
Those Japanese soldiers, especially those in 1930s, were universally well trained in knife fighting. According to memoirs, in 1937, one Japanese soldier could fight 3 to 4 Chinese nationalist soldiers in bayonet charge.
See the first battle in the above posted movie? It's a historical event:
https://en.wikipedia.org/wiki/Battle_of_Pingxingguan
Communist soldiers were those who passed 6000-mile Long-March soldiers, considered being elite both mentally and physically. Ambushing a Japanese supply column in valley. Finally won the battle, but at almost 1 vs 1 casualty ratio. After Chairman Mao heard of this, he told his commanders, "We cannot afford using our best troops this way..." Of course, that was not shown in the movie.