(someone) flock to (someone's) banner

Translations
(кто-то) стекается под знамёна (кого-то)
Many supporters flock to his banner during the campaign.
Многие сторонники стекались под его знамёна во время кампании.
Definitions
To join or support someone enthusiastically, especially by rallying to their cause, leadership, or group, often in large numbers.
Words
someone

pronoun
кто-то
flock

verb
стекаться
to

preposition
к
someone

pronoun
кого-то
s
чей-то
banner

noun
знамя