Very much so. It's surprising how many times that got done, by hand (or perhaps with the help of beasts of burden), here and there. Corliss reproduces a map of western England/eastern Wales to show the route of Offa's Dyke, which is attributed to Offa of Mercia. There's an earlier, apparently much shorter work called Wat's Dyke that antedates Offa's; there's also the post-Roman Wansdyke, which runs west to east across a good bit of southern England, and a very short (probably unfinished) earth barrier called Devil's Dyke, also post-Roman. Ooh, I just took another look at the map, and it doesn't show Offa's Dyke, but that's what's discussed above it.