article_snippet.sent: Chief of General Staff Erich von Falkenhayn decided they would use  the gas the next day or not at all.
article_snippet.sent: The plan was to release the chlorine in the frosty morning hours, when The plan would cling best to the surface and give soldiers a full day to advance.
article_snippet.sent: A windless morning came and went.
article_snippet.sent: The breeze only picked up in the afternoon - and at 5pm the gas cylinders were opened with devastating effect.
article_snippet.sent: But after April 22, the surprise factor evaporated and the stalemate endured.