Kagemusha.
http://www.imdb.com/title/tt0080979/?ref_=nm_flmg_wr_16
https://en.wikipedia.org/wiki/Kagemusha
“Now in full control of the Takeda army, Katsuyori leads the counter-offensive against Nobunaga, resulting in the Battle of Nagashino. Wave after wave of attacking Takeda cavalry and infantry are cut down by volleys of arquebus fire from Oda troops deployed behind wooden stockades, effectively eliminating Katsuyori’s army.”
Yep.
Thanks.
They’re sitting up on the hill and slowly realize that they have lost and slaughtered their Soldiers because they weren’t up with the times.