A convoy is a group of vehicles (of any type, but usually motor vehicles or ships) traveling together for mutual support. Often, a convoy is organized with armed defensive support, though it may also be used in a non-military sense, for example when driving through remote areas.
Source : Dictionary.com / wikipedia
A convoy.
the bakufu
steam ships
Warships traveled with merchant ships for protection
protection
The system you are referring to is the Convoy System. In this system, cargo ships traveled together in groups, typically escorted by navy warships for protection against enemy attacks during times of war. This system was commonly used during World War I and World War II to safeguard merchant ships from submarines and other threats.
The US used a convoy system where a group of ships was shepherded across the Atlantic under the protection of war-ships .
how is the caste system organized?
Merchant Ships
A convoy.
The formation of several ships intended to provide protection against submarine attack was called a wolf-pack.
robust system protection tool
The manor system was organized by people giving back
I think it is organized by Pootangs
barbery pirates
A fleet. If armed, an armada.
hrjr