Ayn Od Milvado

Rav Shapira related that when the Griz came before the draft board and was worried that he would be drafted into the army, his father, Rav Chaim, instructed him to use a segula from the Nefesh HaChaim.

He also told, in the name of the Brisker Rav, that when the Brisker Rav escaped from Warsaw during the Second World War, the Nazis, yemach shemom, had already conquered half of Poland and every road was swarming with murderers. He concentrated on this segula without stopping. For one moment his concentration slipped, and a wicked Nazi attacked them. He immediately returned his focus to the segula of the Nefesh HaChaim, and they were saved.