Christoph,
Here is what I found:
The 299th Combat Engineer Battalion has a nice web site. It does say:
On 16 March 1945, Battalion Headquarters, Headquarters and Service Company and Company C moved to Oberwinter on the Rhine, a few miles north of Remagen. Company B moved to Kripp Germany. The following day about 1000 hours 17 March 1945, the world renowned Ludendorf bridge collapsed in the Rhine.
The Bridge was undergoing repairs at the time and no military traffic was using it. At least 2 ponton bridges and one floating Bailey Bridge were in use by this time in the bridgeheard vicinity. Also several pontoon ferries were operating across the Rhine.
On 21 March 1945, the Battalion assumed the guard and maintenance of the Treadway bridge at Remagen. The Battalion also maintained roads, posted signs, and did engineer work as directed. Company A moved into Remagen this date and on 24 March Company B moved to Erpel.
I do not feel confident that their outfit would have a scout on the other side of the Rhine. I feel there are other outfits already there.
And as to the 15th FA Bn, Leutesdorf is South of Remagen. So I doubt this one even more.
The problem with the First Army is that category is soo huge at that time.
Oh, I was so hopeful, but I am sure we will find the answer!
You would not know I needed to have left here a while ago. But your information was too compelling to leave!
As always, Thank You,
Jean J