SUN PRAIRIE, Wis. -

Firefighters with the Sun Prairie Fire Department held a ceremony Sunday morning to remember the victims of the Sept. 11, 2001 terror attacks.

It marked the 15 -year anniversary of the deadliest terrorist attack in American history.

A total of 343 firefighters died in the attack; they were specifically honored at the ceremony.

"(They knew) fair well that they weren't going to get any honor," Assistant Chief Bill Sullivan said. "It wasn't for the glory, it wasn't for the money."

Sullivan said he was at work when the attacks happened. He recalled how he and his fellow firefighters watched in horror.

"I vividly remember work basically coming to a halt," Sullivan said. "The shock of the day's events as (they) unfolded resonates with us forever."

The department also brought out a piece of steel from the south tower of the World Trade Center, given to it by the Port Authority of New York and New Jersey. It has a permanent home in the 9/11 memorial inside Sun Prairie fire station No. 1.

Sullivan said the ceremony was a way to show gratitude for fellow first responders who made the ultimate sacrifice.

"'Thank you' is the first thing that comes to mind, but yet I don't know that there are words," Sullivan said. "Those guys...they did their job."