When first beset upon by a pair of Nazis at the train station, Emmilius manages to incapacitate both of them with a single uppercut, sending them sprawling.
The animated armors army. Substitutiary locomotion sneers at Nazi science.
Possessed suits of armour:Treguna, macoides and trecorum satis dee.
Nazis: [Utterly speechless]
How would you like to see two thousand years of British military history marching towards you? Mind you that was a heck of a museum for a small coastal village.
The entire scene of the armor approaching the Nazis was one of the coolest scenes ever filmed in that decade. An entire army of British armor from medieval plate armor all the way to redcoats, marching in tune with a creepy faux Latin chant. It's enough to make you tear up if you're on their side and flee in terror if you're not.
Angela Lansbury lead an army of living armor against the Nazis. It doesn't get more awesome than that.
It was so awesome, in fact, that most of the original trailers consisted of nothing but scenes from the climax (although that rather spoiled the surprise) and it remains one of the most memorable things about the movie to this day.
It's never made clear exactly how the spell works, but considering both the flying garments when they first try it out and the armor seem to have personalities and quirks, a case could be made the inanimate objects are actually being guided/influenced/possessed by the spirits of those who own or once owned them. In which case it wasn't just an army of Animated Armor; it was an army of Animated Armorworn by the spirits of soldiers from every major era of British military history.