@JTT,
This is the most hilarious thread I've read in a long time. Except for Roger, talk about the blind leading the blind.
Take the Hill is fairly ubiquitous phrase which means "put everything you have into attacking an enemy that's fortified on higher ground, oust them and occupy the position." Literally, in a military context, it's an aggresive and dangerous thing to do.
Having the hill is when you defend. Taking the hill is the attack.
In other contexts, the phrase means to put everything you have into a single, specific goal.
There are several related phrases. One that's gotten popular recently is "This is not the hill." That's actually a fragment that references a longer sentence, "This is not the hill to die on." And what this means outside of a military context works like this: You'd say this to a colleague who has become so obsessed and overfocused on winning some battle at work that they're in danger of doing damage to themselves and compared to the value of winning the battle, it's not worth it.
For example, if someone was going to march into the CEO's office to give him a piece of their mind about some change in the dress code at work, somone else might say, "Bro, this is not the hill."