From April 1403 to October 1404, Richard commanded a small force defending Herefordshire against the Welsh rebel leader Owain Glyndŵr, but otherwise performed no notable military service. However, it was during this period, according to T. B. Pugh, that Richard established the relationships with the Mortimer and Cherleton families that brought about his marriage to Anne de Mortimer. Richard's only other significant appointment during this period came in August 1406 when, together with the Bishop of Bath, Lord FitzHugh, and Lord Scrope, he was chosen to escort King Henry's daughter Philippa to Denmark for her marriage to King Eric. Richard was knighted in July of that year, perhaps in anticipation of this embassy. Pugh notes that during this three-month embassy to Denmark, Richard would have become well acquainted with Lord Scrope, who married Richard's stepmother Joan Holland in September 1411, and with whom Richard later became involved in the Southampton Plot of 1415 that cost them both their lives.