Some new fortification units for the Dutch OBAT:
https://en.wikipedia.org/wiki/IJssel_Line
The IJssel Line (Dutch: IJssellinie) was the Dutch portion of the NATO Cold War line of defence for Western Europe during the 1950s and 1960s. It consisted of anti-aircraft and four-barrel machine gun bunkers, command and hospital bunkers, and many Ram and Sherman tank bunkers encased in concrete, leaving the turrets exposed. These elements were placed along the IJssel river.[1]
In the case of the Shermans, they basically covered them up in concrete and turned the former engine compartment into a second entrance.