Campaigners failed to stage a stunt in front of the Queen when nine arrests were made before Trooping the Colour.
Nine members of the Fathers 4 Justice group had planned to jump onboard the monarch's carriage at her annual birthday parade.
But police said they made the arrests before the event began and released the group without charge once it was over.
A spokesman for Fathers 4 Justice commented "This is what happened. We had two calls last Thursday from Scotland Yard concerned about the newspaper article last weekend and asking us if we'd be attending 'this weekend'.
"Pray, what is on at the weekend? I asked.
"Trooping the colour they said. Pray, is this an invitation? Says I.
"Either way, what better way to check out the sights and try and cadge a lift with Lizzy & Phil.
One protester dressed at Batman said "Now Princess Anne is getting divorced again and is available, I wanted to tell the Queen that I was available and prepared to serve my country- No strings attached. I tried to do the same three years ago but was stopped on the balcony of Buck House"
A police statement said: "The arrests took place prior to any principals passing and were due to vigilant, robust and decisive police action."
Chief Inspector Richard Head commented, "Last year saw police foil an attempt by two Fathers 4 Justice activists wearing nothing but Union Jack boxer short but luckily for everyone this year they kept the costumes on."