Little is known of F/S Sills at this time. He was a W.op/A.G with Wes Loney & crew and involved in the sinking of U-470 and the attack on U-621

Bill's account of the U-470 sinking: "On the U-470 attack we made four passes in all, getting shot up for our pains. The Germans were not friendly! It was due to Wes’ supreme low flying, in which we climbed over the conning tower, that I had a straight view down inside the U-Boat from a very close standpoint. We were so low that I believe our top camouflage could have been seen from the conning tower. We did not experience much flak on the final run and Wes made a classic drop of DCs from the starboard quarter. Fifteen bods were seen in the water and we whistled them up a destroyer to collect them. Unfortunately, owing to the imminent danger of further attacks, it could not stop and steamed slowly through them with nets out to catch them - this added up to just two.

We attacked on P.L.E., and lost between 100 and 300 gallons of fuel from being shot up. I reckoned 100 and Wes 300, so we settled on 200! We also had our port undercarriage suffering from a 20mm. shell or two. We climbed to Rated Altitude without superchargers and headed back home to Ballykelly. I eased off the mixture until the cylinder temperatures rose, getting it as lean as possible. This caused a drop in airspeed which upset George as he was worried we would not make it, especially as the action had taken place at the bottom end of the Denmark Strait and we had quite a long way to go at night. George couldn’t be blamed as he was as keen as the rest of us to get back safely. We made it but the landing was, to say the least, interesting. We lost the complete port wheel and finished up on the remains of the oleo leg. Still, we were on the runway - just. on dipping the tanks we found that we had about a teaspoon full of fuel in each tank - I estimated we had about 15 minutes left! Wes got a well-deserved immediate award of the D.F.C. for that.’ source