While here the battalion built an 8 mile 10 circuit lead from Garnich, East to the city of Luxembourg where it was to be terminated into Twelfth Army Group TAG headquarters. This job was started on the 6th of October and finished on the 9th. The next build that was assigned the Battalion was a 27 mile line from South of Arlon, Belgium, North to Bastogne. No suitable bivouac sight could be found, along the line which afforded warmth and protection from the elements, so it was decided to operate from billets already occupied in Capellen.

From these billets Company "B" continued on to the Aachen-Liege build, while Company "A" took over a fourteen mile line from Maastricht, East to Heerlen, Holland. This line was begun by the 459th Signal Construction Battalion but was left uncompleted when they were reassigned to the First Air Force and ordered to abandon the build and join their new command.

The 40th Signal Construction has the distinction, by the construction of the Liege-Aachen line, of building the first open wire pole line into Germany by the Allied Forces.

Company "A" continued work on the Maastricht-Heerlen, Holland line until December 6, when the line was completed and turned ever to Twelfth Army Group.

On 11 December, Hq and Hq Company moved from Epen, Holland to Aachen, Germany and settled down to what was expected to be about a months stay.

Companies A and B continued on the line East of Aachen toward Duren, but on the outskirts of the city of Aachen, the battalion began running into mines, and worked was slowed while the Engineers cleared paths for the survey crews.

The Battalion's next assignment was the Aachen-Cologne lead, the latter part of which was still in enemy territory. On the 5th of December, Company "B" began surveying around the city of Aachen, beginning from the last pole of the Liege-Aachen lead and circling the city to the North.

Company "A" moved from Valkenburg, Holland to Brand, Germany, Southeast of Aachen, on 8th of December and on the 9th of December joined Company "B" on the Aachen-Cologne build.

On about the 19th of November, the Germans began to drop Robot bombs into the city of Liege, only three miles away. The tempo of the bombing grew until on the 20th and 21st between forty five and fifty bombs fell on Liege and surrounding towns, including Chenee and Beyne Heusay. On the 2nd of November, Hq, Hq Co and "B" Co, moved twenty five miles Northeast to Epen, Holland, a quiet little town seven miles West of Aachen, Germany Company "A" remained in Chenee until the 25th, when they moved to Mheer, Holland, twenty seven miles Northeast of Chenee.

Company "B" completed the Aachen-Liege build on the 30th of November, but not without incident. On the 27th, while working in the city of Aachen on a side street, a K-43 line construction truck ran onto a German Teller Mine. The right front wheel assembly was completely blown off, with the right front fender, windshield and windows broken, but the driver, Tec 5 Thomas McKinley, was uninjured. On the 27th, a robot bomb hit "A" Companies line near Mickeroux, Belgium, destroying one pole completely and breaking all the wires and losing the sag for about ten spans each way.