And if they blow
taqa`  (taw-kah')
to clatter, i.e. slap (the hands together), clang (an instrument); by analogy, to drive (a nail or tent-pin, a dart, etc.); by implication, to become bondsman by handclasping)
but with one
'echad  (ekh-awd')
united, i.e. one; or (as an ordinal) first
trumpet then the princes
nasiy'  (naw-see')
an exalted one, i.e. a king or sheik; also a rising mist -- captain, chief, cloud, governor, prince, ruler, vapour.
which are heads
ro'sh  (roshe)
the head (as most easily shaken), whether literal or figurative (in many applications, of place, time, rank, itc.)
of the thousands
'eleph  (eh'-lef)
hence (the ox's head being the first letter of the alphabet, and this eventually used as a numeral) a thousand -- thousand.
of Israel
Yisra'el  (yis-raw-ale')
he will rule as God; Jisrael, a symbolical name of Jacob; also (typically) of his posterity: --Israel.
shall gather
ya`ad  (yaw-ad')
to fix upon (by agreement or appointment); by implication, to meet (at a stated time), to summon (to trial), to direct (in a certain quarter or position), to engage (for marriage)
themselves unto thee