I have no memory of the subplot. I assume it was simply a pretense to get us to the battle scenes. That was an impressive cast, rivaling even A Bridge Too Far.
There was that subplot about Charles Heston’s son falling in love with a Japanese internment victim...
Subplot was Charleton Heston’s character being the father of a young butterbar officer who was dating a Japanese girl who, along with her family, were in an internment camp.