Kenway - Sneaks onto boat

Anchored some distance away we watched, and Bartholomew looked at me.
‘Are you stealthy, Edward Kenway?’
‘That I am,’ I said.
He looked over to the Portuguese galleon. It was anchored not far away from land with most of the crew on the gun deck
firing inland, carrying out exercises. Never was there a better time to steal aboard, so at a nod from Bart Roberts I dived overboard and swam to the galleon, on a mission of death.
Shinning up a Jacob’s ladder I found myself on deck, where I moved quietly along the planks to the first man, engaged my blade, swept it quickly across his throat then helped him to the deck and held my hand over his mouth while he died.
All the time I kept my eyes on the lookouts and crow’s-nest above.
I disposed of a second sentry the same way then began scaling the rigging to the crow’s-nest. There a lookout scanned the horizon, his spyglass moving from left to right, past Roberts’s ship and then back again.
He focused on Roberts’s vessel, his gaze lingered on it, and I wondered if his suspicions were churning. Perhaps so.
Perhaps he was wondering why the men on board didn’t look like Portuguese merchants. He seemed to decide. He lowered the spyglass and I could see his chest inflate as though he were about to call out, just as I sprang into the lookout position, grabbed his arm and slid my blade into his armpit.
I swept my other arm across his neck to silence any cries as blood gushed from beneath his arm and he breathed his last as I let him fold to the well of the crow’s-nest.

Assassin’s Creed Black Flag, Chapter 51