You know, when facing down writing a combat scene, I can either try to cobble it together from various action books and lectures recorded at cons and "how to write a thriller"...
Or I can head over to my husband's office, and say, "Um, honey? So, if you were to need to set up an ambush on a set of switchbacks..."
He perked right up, and said, "Oh, do you have a way to get ahold of some heating oil? Even better if you can cut it with cooking oil and soap flakes!" And promptly erased my preconception of what goes where with a very thorough description of a "bloody good ambush." There doesn't seem to be a lot of "theoretical", especially not when he's being extremely specific. "And then, of the two that bailed out the back, if one freezes, the minibus will actually roll back on top of him. It was lovely. Poetic, even. But the one on the uphill side, if he dodges into the brush, he's now less than ten yards away when he's shooting at you. Exciting, that."
...Right, okay, one Bloody Good Ambush scenario now firmly noted down, I just have to write the thing.