A corduroy road or log road is a type of road or timber trackway made by placing logs, perpendicular to the direction of the road over a low or swampy area. The result is an improvement over impassable mud or dirt roads, yet rough in the best of conditions and a hazard to horses due to shifting loose logs. Corduroy roads can also be built as a foundation for other surfacing. If the logs are buried in wet, acidic, anaerobic soils such as peat or muskeg, they decay very slowly. A few corduroy road foundations that date back to the early 20th century still exist in North America. One example is the Alaska Highway between Burwash Landing and Koidern, Yukon, Canada, which was rebuilt in 1943, less than a year after the original route was graded on thin soil and vegetation over permafrost, by using corduroy, then building a gravel road on top. During the 1980s, the gravel was covered with a chip-seal. The late 1990s saw replacement of this road with modern road construction, including rerouting of the entire highway. In World War II corduroyed roads were used by both German and Soviet forces on the Eastern Front. In slang use, corduroy road can also refer to a road in ill repair, having many potholes, ruts, or surface swellings. This should not be confused with a washboard road. Historical uses The earliest recorded use of a corduroy road in England was during the Norman attack on Saxon resistance leader Hereward the Wake who had taken refuge in the marshes on the Isle of Ely. Two contemporary sources say that the Normans built a corduroy road one mile long to try to reach him in 1071 but eventually succeeded in their attack using treachery. Corduroy roads were used extensively in the American Civil War between Shiloh and Corinth after the Battle of Shiloh, and in Sherman's march through the Carolinas. In the Pacific Northwest roads built of spaced logs similar to widely spaced "army track" were the mainstay of local logging practices and were called skid roads. Two of these, respectively on the outskirts of the mill towns of Seattle and Vancouver, which had become concentrations of bars and logger's slums, were the origin of the more widespread meaning of "skid road" and its derivative skid row, referring to a poor area. The Hull's Trace is a military road, built