In the era of the Twilight Invasion, which has the distinction of being one of the worst-documented invasions in Hyrule's history due to the inability of the hylian populace to notice that they were being invaded, since said invasion manifested itself as a looming feeling of fear and very little else. Location - Hyrule Castle Town, down the center path, take the right-hand fork, go down the stairs, and look for a hole in the wall. If there's a door in the hole, then you've found it, and it's an oddly popular location despite being so very hard to find:

Telma had seen the invasion coming from a figurative mile away.

...Well, maybe more like a figurative half-mile. Quarter-mile. Five-hundred feet.

Yes, okay, it had caught her completely off guard and she was still mad about that, thank you very much, but the point was that she was fighting, darnit!

Honestly. She may not have seen this coming but she was not going to lie down and be walked on by some unseen, unknown conqueror. Telma was too stubborn for that.

And conveniently enough, the perfect excuse to get involved happened to walk right through her tavern door one day.

Telma was all too delighted to offer her assistance to the Hero, especially after he proved that he was worthy of that assistance when he helped her escort the poor Zora Prince to Kakariko. Now here, finally, was someone who knew what he was doing, or at least seemed to know what he was doing. How he seemed to know what he was doing was a bit of a conundrum to Telma, but she supposed that as long as the job got done, did it really matter how?

It proved to be the best decision she'd ever made, because this boy made results happen as though he was fishing for them in a barrel with a net. Within a span of mere weeks, the Resistance was fully realized and ready to storm the Castle, and Telma was right there in the middle of it.

This so-called conqueror wasn't going to know what hit him.

There were so many good options when Link looked at books outside of the past legends of the Heroes! Journals, diaries, food logs, shipping invoices, the complete list of everyone who still owed the library money…

No wait, those were just his late fees. Link stuffed that one into his pocket (he was busy, he'd pay them later!) and grabbed for the nearest pen. This tavern logbook had some incredibly suspicious activity after hours, on a curiously consistent basis, and that smelled like an underground rebellion to him.

Next to him, Zelda eyed the maniacal grin on his face and quietly contemplated whether or not she would regret teaching him the wondrous loopholes of Properly Cited Sources.

...Probably.

Rule Number Thirty-One: All naive, busty tavern wenches in my realm will be replaced with surly, world-weary waitresses who will provide no unexpected reinforcement and/or romantic subplot for the hero or his sidekick.