The treaty of 1396 enabled the construction of Hattingens first fortification. It consisted of a "tun-stacket", a wicker fence between oak posts, the moat and the wall of the excavated material. The church paths from the peasants and the two entrances of the highway were secured by five city gates. The city fortification is considered the time of the city. The Hattingers became inhabitants of a castle-like fortification - citizens. The economic upswing - Hattingen was a member of the Hanseatic League - made possible between 1586 and 1590 a renewal of the city fortifications in Bruchstein. It consisted of the inner wall, today's Grabenstraße, the outer wall and the moat in front of it. The old wall was leveled. Around 1820, the city fortification was demolished because it had become defensive technically useless and Hattingen in this time grew beyond its medieval borders. The effectiveness of the fortifications was put to the test in the Thirty Years' War. Colonel Wilhelm Wendt, who was in Swedish service with the Krassenstein, besieged the city with 3,000 mercenaries. After a ten-day lossy siege, the city had to surrender and pay 3,000 gold guilders. "Source: Hattingen historically. Old Town guide