On the twenty-first we reached Freeman's Ford, on the Rappahannock, which we picketed, preventing the enemy from effecting a crossing. As the fords of the river were generally heavily guarded up to this point, the enemy kept moving up the stream toward our right, evidently designing to make a flank movement upon us. On the twenty-second a notable cavalry engagement, with light artillery, took place at Waterloo Bridge. During this fight a Rebel shell took effect in our ranks, killing instantly the three horses ridden by the three officers of the same company, dismounting the braves very unceremoniously, but injuring no one seriously. Through the darkness of the night following, Stuart, with about fifteen hundred picked cavalry, effected a crossing of the river, and after making quite a _detour_ via Warrenton, came down unperceived through the intense darkness and the falling rain upon General Pope's headquarters near Catlett's Station. He captured the general's field quartermaster and many important documents, made great havoc among the guards, horses, and wagons, and finally escaped, without injury to himself, with about three hundred prisoners, and considerable private baggage taken from the train. His victory was indeed a cheap one, but we all felt its disgrace, which the darkness to some extent explained, but did not fully excuse. _August 23._--A severe contest occurred to-day at Sulphur Springs. The enemy is pressing us hard at every crossing of the river, and continues to move towards our right. Skirmishing occurs at nearly every hour of the day and night, occasioning more or less loss of life. Yesterday in a skirmish led by General Sigel, who had crossed the river, General Bohlen was killed, and our forces driven back to the north side of the river. While this manoeuvring was going on along the Rappahannock, General Lee had despatched Stonewall Jackson, to pass around our right, which he did by crossing about four miles above Waterloo, and, on the twenty-fifth, he struck our forces at Bristoe Station, where a severe contest took place, the losses in killed and wounded being heavy on both sides. But the enemy was successful in taking possession of the railroad; and in the evening a portion of Stuart's cavalry, strengthened by two regiments of infantry, advanced to Manassas Junction, where they surprised and charged our guards, capturing many prisoners, also ten locomotives, seven trains loaded with immense quantities of stores, horses, tents, and eight cannon. They destroyed what they could not take away. The Rebel General Ewell, having followed closely in the track of Jackson, also came upon the railroad in rear of General Pope's army.