The number of FBI agents to make an arrest (and search) at Roger Stone's house

[T]he more law enforcement personnel that are present, the more quickly and efficiently a home can be searched. Two dozen agents can finish their work and leave the neighborhood more quickly than two agents. Agents in the FBI are highly trained, and many will have specific skills and assigned duties at an arrest and search scenario. Remember, the FBI had two warrants that morning—one for Stone’s arrest and one to search his home—both authorized by a federal judge who found the government met the requisite Fourth Amendment probable cause standard. Having two warrants to execute, in and of itself, requires more agents.

Generally, the FBI would bring an entry team, an arrest team, a perimeter security team and an evidence response team. The entry team is usually the smallest, at around three to four agents, and the evidence response team the largest, perhaps with 10 to 12 agents and personnel. The entry team would approach the house and enter it, and then secure it so it is safe for others to go in. The security team, of six to eight agents, would ensure that bystanders could not approach, for their own safety and the safety of the agents inside the home. While the arrest team of maybe five to six agents was doing its work, the evidence response team would be responsible for collecting and processing evidence from the home, pursuant to the court-authorized warrant, and would likely include a photographer and a computer forensic expert or two.

Throw in a small team to transport Stone to the courthouse, an on-scene supervisor and, possibly, a public affairs officer, and that could add up to more than two dozen FBI personnel at and around Stone’s home.

The FBI would likely have coordinated with local police on the search, and that local department might help block streets and control traffic. So add in some additional cars and officers. Because the Stone home backs to water, it is possible that local police officers were there on a boat.

  Lawfare Blog

So, stop whinging about it, Stone fans.

...but hey, do what you want...you will anyway.