One of the World War I’s most enduring legacies is largely forgotten: It sparked the modern gay rights movement.

Gay soldiers who survived the bloodletting returned home convinced their governments owed them something – full citizenship. Especially in Germany, where gay rights already had a tenuous footing, they formed new organizations to advocate in public for their rights.

Though the movement that called itself “homosexual emancipation” began in the 19th century, my research and that of historian Jason Crouthamel shows that the war turned the 19th-century movement into gay rights as we know it today.

A death in Russia

In the winter of 1915, a German soldier died in a field hospital in Russia. The soldier, whose name is missing from the historical record, had been hit in the lower body by shrapnel when his trench came under bombardment. Four of his comrades risked their lives to carry him to the rear. There, he lay for weeks, wracked by pain in the mangled leg and desperately thirsty. But what troubled him most was loneliness. He sent letters to his boyfriend whenever he could manage it.

“I crave a decent mouthful of fresh water, of which there isn’t any here,” he wrote in his final letter. “There is absolutely nothing to read; please, do send newspapers. But above all, write very soon.”

This soldier, who had to keep his relationship hidden from those around him, was just one of the approximately two million German men killed in World War I. His suffering is not unlike what many others experienced. What his loved ones made of that suffering, however, was different, and had enormous consequences.

His boyfriend, identified in surviving documents only as “S.,” watched the man he loved go off to serve in a war that he did not fully endorse, only to die alone and in pain as S. sat helplessly by hundreds of miles away. S. told their story in a letter to the Scientific Humanitarian Committee, which published it in April 1916.

The Scientific Humanitarian Committee was then the world’s leading homosexual emancipation group, boasting a membership of about 100 people. The soldier’s story took a cruel twist at its very end: S.‘s loving replies were lost in the chaos of the war and never reached the soldier.

“He died without any contact from me,” S. wrote.

Demanding the rights of citizens

After the war, many believed the slaughter had been for nothing. But S. saw a lesson in his partner’s suffering and death.

“He has lost his bright life … for the Fatherland,” wrote S. That Fatherland had a law on the books that banned sex between men. But the sodomy law was just the tip of the iceberg: S. and men like him generally could not reveal their love relationships in public, or even to family members. Homosexuality meant the loss of one’s job, social ostracism, the risk of blackmail and perhaps criminal prosecution.

S. called it “deplorable” that “good citizens,” soldiers willing to die for their country, had to endure the status of “pariahs.” “People who are by nature orientated toward the same sex … do their duty,” he wrote. “It is finally time that the state treated them like they treat the state.”

A new phase of gay rights

Many veterans agreed with S. When the war ended, they took action. They formed new, larger groups, including one called the League for Human Rights that drew 100,000 members.

This article was originally published on The Conversation.

Laurie Marhoefer, Assistant Professor of History, University of Washington