Thus were
'el-leh  (ale'-leh)
these or those -- an-(the) other; one sort, so, some, such, them, these (same), they, this, those, thus, which, who(-m).
the journeyings
macca`  (mas-sah')
a departure (from striking the tents), i.e. march (not necessarily a single day's travel); by implication, a station (or point of departure) -- journey(-ing).
of the children
ben  (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
of Israel
Yisra'el  (yis-raw-ale')
he will rule as God; Jisrael, a symbolical name of Jacob; also (typically) of his posterity: --Israel.
according to their armies
tsaba'  (tsaw-baw')
a mass of persons (or figuratively, things), especially reg. organized for war (an army); by implication, a campaign, literally or figuratively (specifically, hardship, worship)
when they set forward
naca`  (naw-sah')
to pull up, especially the tent-pins, i.e. start on a journey