Mix flour, salt, and sugar in a large bowl.

Stir in milk until well combined.

Add the melted shortening, molasses, and soda mixture to the flour mixture.

Mix until all ingredients are thoroughly combined.

Grease and flour one large or two small bread pans.

Place the dough into the prepared pan(s).

Cover the pan(s) with similar pans to create a sealed environment.

Bake in a preheated 350°F (175°C) oven for 1 hour and 30 minutes to 2 hours, or until a toothpick inserted into the center comes out clean.