What obstacles did US Marines have to overcome to capture guadalcanal?

US Marines faced several significant obstacles in capturing Guadalcanal, including harsh tropical weather, difficult terrain, and fierce resistance from Japanese forces who were well-entrenched and committed to defending the island. Additionally, logistical challenges such as limited supplies and inadequate transportation hindered their operations. The Marines also dealt with the threat of disease, including malaria and dysentery, which affected their fighting capabilities. Ultimately, their determination and strategic planning helped them secure the island despite these challenges.