bigpigeon.us webpage WWII - Germany > ETO > Enemy Counteroffensives > The Northern Bulge, updated by RAC 23 Jul 2022. Incomplete.
The accompanying map shows Wehrmacht penetration in the extreme northern portion of the bulge.
The bulk of US V Corps was able to withdraw to Elsenborn Ridge (see the red oval), from which they fought a bloody but successful defense.
US artillery on Elsenborn Ridge curtailed Sixth SS Panzer Army use of nearby roads and thus helped prevent the hoped-for Sixth SS Panzer Army breakout to Antwerp.
The best-known Wehrmacht advance in the northern Bulge was the early thrust by the notorious Kampfgruppe Peiper early in the battle. Fortunately this thrust ran out of gas, literally and figuratively, before reaching the Meuse.
Thus the furthest advance in the Bulge was made by Fifth SS Panzer Army to the south.
Sources for the WWII Enemy Counteroffensives > The Northern Bulge webpage: