On July 1, 1916, the first day of the Battle of the Somme took place. The British Army suffered the worst day in their military history losing 19,240 men with more than 38,000 wounded. An excerpt from the article:
"The Battle of the Somme, which took place from July to November 1916, began as an Allied offensive against German forces on the Western Front and turned into one of the most bitter and costly battles of World War I.
British forces suffered more than 57,000 casualties—including more than 19,000 soldiers killed—on the first day of the battle alone, making it the single most disastrous day in that nation’s military history. By the time the Battle of the Somme (sometimes called the First Battle of the Somme) ended nearly five months later, more than 3 million soldiers on both sides had fought in the battle, and more than 1 million had been killed or wounded."