The general strength of the wartime army varied greatly depending on a number of factors: the authority of the king, the population of the territories he controlled, and the season of year. Because most of the conscripts were farmers, most wars were fought during the dry season. The famous Forty Years' War was largely fought during the dry season, and armies went back to till the land during the rainy season. Only a few times in the imperial era was the decision to extend the campaign to the rainy season made, most notables being the First Anglo-Burmese War and the Burmese–Siamese War (1765–1767).