Every year he drank a glass of wine in observance of the anniversary of the battle of Antietam

From The Metaphysical Club by Louis Menand. Menand opens with a discussion of one of the founding members of the Metaphysical Club, Oliver Wendell Holmes, Jr.

Oliver Wendell Holmes, Jr., was an officer in the Union Army. He stood six feet three inches tall and had a soldierly bearing. In later life, he loved to use military metaphors in his speeches and his conversation; he didn't mind being referred to good-naturedly as Captain Holmes; and he wore his enormous military mustaches until his death, in 1935, at the age of ninety-three. The war was the central experience of his life, and he kept its memory alive. Every year he drank a glass of wine in observance of the anniversary of the battle of Antietam, where he had been shot in the neck and left, briefly behind enemy lines, for dead.

But Holmes hated the war. He was twenty years old and weighed just 136 pounds at the time of his first battle, at Ball's Bluff, where he was shot through the chest. He fought bravely and he was resilient, but he was not strong in a brute sense, and as the war went on the physical ordeal was punishing. He was wounded three times in all, the third time in an engagement leading up to the battle of Chancellorsville, when he was shot in the foot. He hoped the foot would have to be amputated so he could be discharged, but it was spared, and he served out his commission. Many of his friends were killed in battle, some of them in front of his eyes. Those glasses of wine were toasts to pain.

Holmes recovered from the wounds. The effects of the mental ordeal were permanent. He had gone off to fight because of his moral beliefs, which he held with singular fervor. The war did more than make him lose those beliefs. It made him lose his belief in beliefs. It impressed on his mind, in the most graphic and indelible way, a certain idea about the limits of ideas. This idea he stuck to, with a grimness and, at times, a cynicism that have occasionally repelled people who have studied his life and thought. But it is the idea that underlies many of the opinions he wrote, long after the war ended, as an associate justice on the United States Supreme Court. To understand the road Holmes had to travel in order to write those opinions, we have to go back to one of the worlds the Civil War made obsolete, the world of prewar Boston.