縦陣 is read as じゅうじん (juujin) and means column.
じゅうじん
juujin
たんじゅうじん
single line (of ships)
たて
(weaving) warp
たてがき
writing vertically
たてじく
connection between past and present
たてよこ
length and breadth
じゅうおう
every direction
じゅうだん
cutting vertically
たてわり
dividing vertically
じゅうおうむじん
freely
じゅうそう
stretching out (in a longitudinal direction)
たていと
じゅうかん
running through