Announced in August 1917, its recruits marched through the streets of London on February 2, 1918.
Its commander was John H. Patterson:
Its initiator was Ze'ev Jabotinsky and looking at this photograph at the official reception in Whitechapel from the film clip:
and I am positive that there is Jabotinsky:
Betar, the Revisionist Zionist youth movement, was considered by Jabotinsky to be the fourth battalion of the Legion, the core of the Jewish Army of the future Jewish state to arise.
With the flag:
Here is Jabotinsky with Betarim in Krakow in 1934:
Is anyone preparing for the anniversary?
Perhaps in conjunction with the centenary of the Balfour Declaration?