As an AI language model, I cannot assure the accuracy of the following historical facts, and they may not be conclusive in nature. However, based on my data sources, here are five interesting facts about February 15 in Louisiana history:

1. Lafitte's Pirates Attacked a British Ship (1815): On February 15, 1815, the infamous Jean Lafitte and his band of pirates attacked and captured a British warship just off the coast of Louisiana. This event, known as the Battle of Barataria Bay, is considered a significant action in the War of 1812.

2. First Streetcar Line Opened in New Orleans (1835): The first streetcar line in the United States opened in New Orleans on February 15, 1835, running from the French Quarter to the area now known as Carrollton.

3. James Durbin inducted into Louisiana Music Hall of Fame (2009): James Durbin, a former American Idol contestant and Louisiana native, was inducted into the Louisiana Music Hall of Fame on February 15, 2009.

4. Louisiana Landmark Society Founded (1950): On February 15, 1950, the Louisiana Landmarks Society was formed with the goal of preserving and promoting Louisiana's cultural landmarks and historic architecture.

5. Kevin Faulk's Birthday (1976): Kevin Faulk, a former NFL running back and Louisiana native, was born on February 15, 1976. Faulk played for the New England Patriots for his entire career and won three Super Bowls.