On July 20, Red Cloud's warriors attacked a wagon train of 37 soldiers and civilians, killing two, at Crazy Woman Fork of the Powder River. After they attacked other civilian wagon trains, nearly all civilian traffic on the Bozeman Trail ceased. Carrington could only be re-supplied with food and ammunition by heavily guarded wagon trains. In the weeks and months that followed, the Indians repeatedly attacked the wagon trains that sallied out of Fort Kearny to cut construction timber in a forest six miles away. For defense, the wood trains were large, consisting of two parallel lines of 24 to 40 wagons guarded by mounted soldiers on either flank. In the event of an attack, the wagons were quickly drawn into an corral for defense. Fifteen Indian attacks near Fort Kearny between July 16 and September 27 resulted in the deaths of 6 soldiers and 28 civilians and the loss of several hundred horses, mules, and cattle. Carrington's hay-cutting machine was also destroyed.