You've fought the battle for hours. Your team is down to one man. You flee. The enemy pursues. you're pinned, about to be struck down, when reinforcements arrive! They throw the enemy off and save you, just in time, but ... where did they get those tights?
The Men of Sherwood: In short, the Cavalry. This strategy trope consists of a large group of often nameless characters (with a few recognizable faces in their midst) who rush in to save the protagonist, usually with little to no casualties. Their numbers alone make the enemy flee in terror. They may or may not wear tights.
Not to be confused with The Red Shirt Army, the exact opposite.
Sometimes a hero can't do it all on his own. Just ask Paul from Dune. Not only did he find a bunch of desert people to help him overthrow the floating fat man - a pack of giant worms came to help, too!
"This is it - back me up guys ... Guys?"
Now, the Men of Sherwood may not always be on the hero's side, but they have sense enough to rush in and take care of any loose ends.
"Forget about Batman - save those hostages!"
And how about The Order of the White Lotus? Who said a bunch of old guys can't pitch in to help bring an end to the Fire Lord's rule?
"They may take our Air, but they will never take our Fire!"
The Men of Sherwood don't have to be people in hiding or living in the woods. Any military force or a mob of angry villagers will do, but they have to make a sweeping victory with little to no losses. It's also helpful if you foreshadow this saving grace for maximum effect.
When have The Men of Sherwood appeared in your story? Where else have you seen this trope used. Do you think tights are required?
I'm David, and on the first light of the fifth day, look to the east ...