mule train

a line of pack mules or a line of wagons drawn by mules.

Origin of mule train

An Americanism dating back to 1840–50

There is no chance of stopping another reco (that is, a mule-train, sirs) now.

Westward Ho! |Charles Kingsley
The mule-train looks oddly enough, and yet through these muddy roads it seems to be a necessity.

Three Years in the Federal Cavalry |Willard Glazier
The mule-train with our tents and baggage passed us in the valley while we were sweltering under the hawthorns.

Out-of-Doors in the Holy Land |Henry Van Dyke
The freight capacity of the mule-train placed a narrow limit upon the profits and extent of trade.

The Last American Frontier |Frederic L. (Frederic Logan) Paxson

The enemy was still pressing on, and the mule-train of small ammunition could not be got up under the heavy fire.

The Campaign of Chancellorsville |Theodore A. Dodge