During World War I, the major geographical barrier was the rugged terrain of the Swiss Alps. Although many conflicts occurred across different fronts, the challenge posed by such geographical features significantly influenced troop movements and military strategies. The ruggedness of mountainous areas made it difficult for large-scale troop movements and logistics. This impacted not only the Western and Eastern Fronts but also contributed to the static nature of trench warfare, particularly on the Western Front, where soldiers were entrenched in fortified positions, leading to prolonged stalemates and heavy casualties.