As their stations, for the most part, remained fixed and permanent, we may venture to describe the distribution of the troops.

Three legions were sufficient for Britain.
The principal strength lay upon the Rhine and Danube, and consisted of sixteen legions, in the following proportions: two in the Lower, and three in the Upper Germany; one in Rhaetia, one in Noricum, four in Pannonia, three in Maesia, and two in Dacia.

The defence of the Euphrates was intrusted to eight legions, six of whom were planted in Syria, and the other two in Cappadocia.

With regard to Egypt, Africa, and Spain, as they were far removed from any important scene of war, a single legion maintained the domestic tranquillity of each of those great provinces.

Even Italy was not left destitute of a military force.
Above twenty thousand chosen soldiers, distinguished by the titles of City Cohorts and Praetorian Guards, watched over the safety of the monarch and the capital.