A second, later 'house' of the Lords of Giessen, stood to the north, near the small river Alm, and was mentioned in 1364.

In that year Arnoud of Giessen was granted his strong house in fief by Willem II of Horne.

At that time, Gerard I of Horne held Giessen Castle as a security from the Count of Guelders.

[4] The conflict was partly ended by arbitration by the Count of Holland in September 1307.

In the early 21st century Woudrichem municipality wanted to allow the construction of houses on part of a terrain at Burgstraat (castle street).

However, the archaeologists probably thought of a tower house, and not of a full blown water castle.

At the time, the type of castle that was found was only built by the rulers and the (Holland) high nobility.

Near the bridge between the main castle and outer bailey, a serious amount of brick debris was found.

[10] On the small part of the outer bailey that was investigated, the foundation of a bridge (bridgehead) towards the castle was found.

The foundation was made by using mortar, leading to the conclusion that it was built while the water level had been artificially lowered, probably in summer.

The three lowest layers of brick were simply laid without joining them with mortar, perhaps because the area could not be made dry.

[16] In the center of the main castle, an L-shaped piece of a foundation of 8.5 m long and 2.2 m wide was found.

A possible and likely structure to have stood at this place is an 8.5 by 8.5 m square or rectangular tower house, of maximum about 13 m high with three floors.

[17] The results of the ground-penetrating radar investigation show that on the outside of the southeast corner, there was a construction that was most probably a tower house of about 9 by 9 m, with an annex of 6 by 8 m.[16] The authors of the archaeological report about Giessen Castle have tried to classify it as a known subtype of castle, but this was not possible.

The semi-circular form of the ring wall of Giessen resembles that of Haamstede.