He surrounded all the Midianites: Midianites probably refers to other Arab tribes, but translators should use the name Midianites.

Burned their tents and plundered their sheepfolds: Revised Standard Version and Good News Translation do not make it clear that Holofernes’ army completely surrounded the Midianites before performing these two actions. It was also his soldiers that did these things, not Holofernes himself. So we may translate “After Holofernes’ soldiers had surrounded the Midianites, they burned their tents and slaughtered their sheep.” In some languages tents will be difficult to translate, and will need a descriptive phrase; for example, “a temporary [or, portable] shelter” or “house made from animal skins.”

Quoted with permission from Bullard, Roger A. and Hatton, Howard A. A Handbook on Judith. (UBS Helps for Translators). New York: UBS, 2001. For this and other handbooks for translators see here.