sectors had been additionally fortified. Instead of inundations it had been decided to place forward positions ahead of the main defences. In the meantime a large and bomb-proof pump house had come under construction that, once it would be operable, would be able to flood the area in front of the Grebbeberg after all. Also this counter-measure came too late in time. This left the Grebbeberg as a very vulnerable position in the entire Grebbeline. That had not gone unnoticed by the attackers to be. The Germans had extensively studied the battle grounds that they were to use in May 1940. Way ahead of the actual invasion German army staff officers managed to visit the Grebbeline in civilian outfits, carefully studying the actual threats and opportunities. Particularly the Rhenen area, close to the Rhine river, was noticed. It was the shortest away from German soil and seemed to be a weak spot in the Dutch defence line. The 207th Infantry Division chose to place its most formidable push at this point, for which it had the motorized SS Regiment Der Führer at its disposal too. The adjacent 227th Infantry Division, accompanied by the motorized SS Leibstandarte 'Adolf Hitler', had a less profound picture of the plans ahead. It chose to decide where to attack during the operation instead of before. Come May 1940, the two German divisions c/w their respective SS Regiments and additional heavy artillery regiments had little trouble overcoming the first obstacles and managed to reach the Grebbeline on the second day, although the 227th division would need more time, meeting more Dutch resistance on the way. The 207th division was supported by five artillery battalions and spearheaded by the fanatic SS Der Führer regiment. The latter had first raided the Arnhem fortifications near Westervoort and subsequently massed in the city of Wageningen opposing the Grebbeline. On the second day the SS regiment managed to take the forward defences, albeit that it took them all day and losses mounted considerably. The third day they managed to penetrate the front line near the Grebbeberg itself, fighting the rest of the day and evening to widen the gap. The SS was blocked by the last Dutch defence line though, causing the commander of the 207th division to move in his own division and move SS Der Fuhrer away to the north of the Grebbeberg. The SS Regiment had by then