[spoilers Extended]why did orys baratheon take only a thousand knights to the boneway
why not archers,men at arms etc
for context
Orys later joined King Aegon I in the First Dornish War in 4 AC, leading an assault on the Boneway with one thousand picked knights. His horses struggled up the stony, narrow, and twisty paths, while his knights were hit with boulders from above, the work of defenders the stormlanders never saw. Where the Boneway crossed the river Wyl,^([1]) the cunning Dornishmen launched a night raid, raining arrows, rocks, and spears from above^([11]) as the stormlanders crossed a bridge. The bodies of the invading army blocked the Boneway from both ends, and when Lord Orys ordered his men to fall back, a triggered rockfall cut off their retreat. With no way forward or back, the stormlanders were massacred, save for Orys and a dozen other lords thought worth the ransom. However, Orys and his bannermen found themselves the captives of the Wyl of Wyl, the savage mountain lord called the Widow-lover