З167
СТАНОВИТЬСЯ/СТАТЬ (ВСТАТЬ) ПОД ЗНАМЯ (ПОД ЗНАМЁНА) кого-чего
litVPsubj:
humanfixed WO to join s.o. , some group or movement in order to struggle for their side, defend their interests: Х-ы встали под знамя Y-ов — Xs rallied to the banner of Ys
Xs united under (beneath) the banner of YsXs joined the ranks of Ys.