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
In a feudal system, society was organized into a hierarchy where the king was at the top, granting land to nobles or lords in exchange for military service and loyalty. The lords, in turn, had vassals—lesser nobles or knights—who served them and provided protection and service in return for land or fiefs. At the bottom of this hierarchy were the peasants or serfs, who worked the land and provided food and labor in exchange for protection and a place to live. This system created a network of obligations and services that defined social and economic relationships in feudal society.
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 .
Merchant Ships
how is the caste system organized?
A convoy.
The formation of several ships intended to provide protection against submarine attack was called a wolf-pack.
A fleet. If armed, an armada.
hrjr
barbery pirates
I think it is organized by Pootangs
The manor system was organized by people giving back
robust system protection tool