How many number of units deployed by the new york city fire department during world trade center attack?

The New York City Fire Department (FDNY) deployed a total of 200 units to the World Trade Center attack on September 11, 2001. These units included fire engines, ladder trucks, rescue companies, and other support vehicles. Over 343 FDNY firefighters lost their lives in the attacks, making it the deadliest day in the department's history.