Wikipedia
A garrison ration is the quantity and type of food served to a soldier when they are stationed somewhere. It is generally not the same as the rations fed to troops in combat or transit - usually termed combat rations, field rations, marching rations or some other task-specific term. This term is mostly used with respect to historic militaries. Modern thinking about nutrition and military logistical support is generally very different today, although people may still speak of garrison rations in relatively underdeveloped countries.
Traditionally, the garrison ration of an army was quite simple and often inadequate for basic nutrition. The British army in the 18th century encouraged troops to grow vegetables at their bases, and sometimes raise livestock, in order to supplement their nutrition. British garrison rations at the time generally consisted of one pound of bread and three-quarters of a pound of beef daily. 1