How were the 3 grandchildren of queen Victoria in the war?

Queen Victoria's three grandsons—George V of the United Kingdom, Wilhelm II of Germany, and Nicholas II of Russia—were all monarchs during World War I. Their respective countries found themselves on opposing sides, with George V leading Britain and Wilhelm II at the helm of Germany, while Nicholas II was the ruler of Russia until his abdication in 1917. The war strained their familial ties and highlighted the complexities of royal lineage in the context of national conflicts. Ultimately, the war and its aftermath contributed to the decline of monarchies in Europe, including the fall of the Russian and German empires.