The first archaeological excavation at the great stronghold in Tum near Łęczyca was started in 1948 by Professor Konrad Jażdżewski together with Janina Kamińska, Andrzej Nadolski and a number of other archaeologists. In accordance with relevant research methodologies, the excavation was begun by digging through the main rampart. During the works, numerous traces of rotten timber, the remains of timber defensive structures dating back to the 8th century BC, were discovered. Antoni Klein, an engineer and resident of nearby Łęczyca, helped in documenting these archaeological finds by creating his own alternative picture documentation, in which he successfully rendered the original size of the rotten timbers and reconstructed the woodwork joints. Andrzej Nadolski used this documentation to make a series of reconstruction drawings of the entire rampart structure. The timbers from the lowest section of the rampart, which had survived in the wet ground and retained their natural size, served as a reference point for him. Under the direction of Andrzej Nadolski, Antoni Klein’s son, Andrzej Klein, prepared the technical as well as lifelike reconstruction drawings of the rampart. Professor Konrad Jażdżewski made every effort to supply the newly created archaeological centre of Łódź with high quality exploratory equipment and measuring instruments. The archaeological excavations conducted at Tum stronghold in the years 1948-1955 were considered as exemplary Polish excavations in respect of modernity and precision of documentation. In his reconstruction of the stronghold fortifications, Andrzej Nadolski made the best use of these methodological as well as technical opportunities and his reconstruction of the early medieval stronghold defensive structures in question, prepared with the help of very talented Antoni and Andrzej Klein, remains a model work