《明史·志·卷六十八》
京城团营官马有一万匹，与旗手等卫当值官马，都分别放置于草场。
京师团营官马万匹，与旗手等卫上直官马，皆分置草场。
There were ten thousand horses in the capital's battalion camp; along with the guardsmen and other guards on duty, they were all placed in grasslands.