Tesla Inc.’s rough stretch in Europe continued as data from Germany and the U.K. showed the U.S.-based electric-vehicle maker’s sales were cut in half last month.

Tesla faces an uphill battle if it wants to stop the bleeding in Europe and retain its dominant market share. Unlike in the US, where the brand doesn’t have to deal with the threat posed by Chinese automakers, a growing number of EVs from China are flooding European shores, more often than not offering better features for lower prices.