Pre heat oven to 350°F and warm baguette in a pre heated oven for 10 minutes.
Slice corned beef into 1/4" slices.
Heat 1/2 cup au jus from the brisket in microwave on high for 1 minute.
Slice baguette lengthwise, top one side with 2-3 slices of corned beef place top on the sandwich. Pour heated au jus into a small bowl, add a few baby dill pickles and serve on the side.