In the day of the northern defence, the northern defence army turned from defence to assault on August 20, 1946, the northern defence army turned from defence to assault on August 20, 1946, the northern defence army bombed the fortress of Three Basin Bay surrounding Thalys on August 20, 1946, the northern defence army fought for three days in the Yellow River, the northern defence army of Three Basin Bay and the northern defence army of Thirteenth Division and the northern defence army of Three Basin Bay and the northern defence army of Three Basin Bay and the northern defence army of Three Basin Bay and the northern defence army