The Battle of Grand Gulf was fought on April 29, 1863, during th: The prevailing wind is from the southwest and bears frequent spells of mild and wet weather from the Atlantic Ocean,[136] although the eastern parts are mostly sheltered from this wind. Since the majority of the rain falls over the western regions, the eastern parts are the driest. Atlantic currents, warmed by the Gulf Stream, bring mild winters, especially in the west where winters are wet and even more so over high ground. Summers are warmest in the southeast of England and coolest in the north. Heavy snowfall can occur in winter and early spring on high ground, and occasionally settles to great depth away from the hills.[145]