In the 1st Corps under Wadsworth, Colonel Robinson fought at Fitzhugh's Crossing, April 29, the transit being hotly contested by the rebels, and he received orders to cross with his regiment on pontoons, which was done. They were ordered back, and the skirmish across the river continued until the Battle of Chancellorsville, and the brigade reached the field as support, Sunday morning, May 3. The regiment took its former position afterwards below Fredericksburg and remained until General Wadsworth ordered General Reynolds to detail Colonel Robinson with a command of troops (which was composed of his own regiment, two companies of the 2nd Wisconsin and the 56th Pennsylvania Infantry) to report to General Russell. Accordingly, he crossed the Rappahannock with his command at Kelly's Ford, found General Russell at Brandy Station and supported a cavalry force in a reconnaissance towards Culpeper Court House, June 9.