Medieval soldier

Much to my surprise, and delight, I discover that an ancestor of mine fought in the so-called Hundred Years War. I had traced my lineage back to the small village of Ascott-under-Wychwood, Oxfordshire to the 15th century. Records, written in Latin, have been found bearing my surname, in an Oxford college, and many from the 16th century exist in church and other official bodies' archives. However, this new discovery, discovered on a database on www.medievalsoldier.org, is dated 1384 and predates the oldest record by a distance. The curious thing is, though, that William Chaundy, a man-at-arms, was based at the Berwick Garrison, a long way from Oxfordshire. There may be a plausible reason for this. I shall make enquiries.