▁Dy ke ▁was ▁built ▁around ▁A . D . ▁ 3 6 0 , ▁transition ing ▁into ▁Gr im ' s ▁D itch ▁which ▁dates ▁to ▁ 3 0 0 ▁B . C ., ▁or ▁the ▁ 2 7 0 - kil omet re - long ▁Off a ' s ▁Dy ke . ▁ ▁In ▁the ▁case ▁of ▁the ▁Norm ans , ▁too , ▁the ▁existence ▁of ▁H aged iken ▁- ▁emb ank ments ▁plant ed ▁with ▁h ed ges ▁- ▁is ▁recorded . ▁ ▁Middle ▁A ges ▁and ▁Modern ▁Period ▁▁ ▁As ▁a ▁rule , ▁media eval ▁land wehr s ▁consist ▁of ▁one ▁or ▁more ▁im pen et rable ▁lines ▁of ▁h ed ging ▁made ▁of ▁ple ached ▁horn be am ▁– ▁( the ▁Geb ück ) ▁- ▁under pl anted ▁with ▁th orn y ▁bush es ▁such s ▁as ▁black th orn , ▁ha w th orn , ▁dog ▁rose , ▁br amb les ▁or ▁hol ly ▁– ▁( the ▁Ged ör n ). ▁ ▁In ▁addition ▁there ▁was ▁also ▁usually ▁a ▁combination ▁of ▁one ▁or ▁more ▁of ▁the ▁following ▁elements : ▁▁ ▁One ▁or ▁more ▁parallel ▁ear then ▁r amp arts ▁between ▁or ▁on ▁which ▁the ▁h edge ▁was ▁plant ed ▁ ▁A ▁path ▁for ▁the ▁maintenance ▁of ▁the ▁h edge ▁and ▁for ▁pat rolling ▁the ▁land wehr ▁ ▁D itch es ▁in ▁front , ▁between ▁and ▁behind ▁the ▁r amp arts , ▁which ▁were ▁sometimes ▁filled ▁with ▁water , ▁depending ▁on ▁the ▁location ▁e . g . ▁in ▁a