Fort Lisse is a short distance from the village of Ochyro, which is 2 kilometres from the town of Nevrokopi. At this fort the Greek army held out bravely against attacks by German and Bulgarian divisions on 6^th and 7^th April 1941. In memory of this battle a memorial has been erected to those who lost their lives and a small museum has been built. This museum has recently been renovated and re-opened its doors to the public in 2002.

The museum’s exhibits include firearms (revolvers, pistols, rifles, machine-guns, hand grenades etc.) belonging to the Greek and German armies, army uniforms, medals, various personal belongings of soldiers and officers, and a 1941 map detailing the Battle of the Forts. In the courtyard there is also Greek army artillery which was used to defend the forts.