Also see definition of "Rearward" in Word Study
Rearward
REARWARD [isbe]
REARWARD - rer'-word ('acaph, "to gather," Nu 10:25; Josh 6:9 (the King James Version margin "gathering host"); Isa 52:12).See ARMY; DAN, TRIBE OF; WAR, 3.
Also see definition of "Rearward" in Word Study