I’m pretty sure it’s a fragment
I'm not sure but I think this is what it means:
When [we] ran in, [we] saw the squadron waiting. This means they ran in wherever they were running in and saw a group of military soldiers that were lined up in a military formation, called a squadron. They saw their friends waiting for them, troubled, looking out at the sea. They beached, or laid the ship (her) ashore and grounded her/the ship to shallow water in the sand. Then they got of the ship and waded through the water onto the sandy beach.
I hope I helped! Again I'm not sure if I am correct but I hope I helped you somewhat.
<span> involving the provision of a complete product or service that is ready for immediate use</span>