Resilience fire crews from Herts working throughout the first of three strikes planned for this weekend received two 999 calls during the five-hour walkout.
Neither call was an emergency that needed attending. One was an automatic fire alarm and the other was a non-existent lorry fire on the M25.
Roy Wilsher, Chief Fire Officer and Director of Community Protection, said: “The contingency plans that were put in place have stood up well. We have been delighted by the consistent dedication and commitment of staff who did work.
“We would like to once again thank everyone who took extra care during the strike action and heeded the safety advice given prior to the walkout.
“We continue to hope that the government and Fire Brigades Union can resolve their dispute and that further walkouts can be avoided.”
Further strike action is due to take place tomorrow from 2pm to 2am and on Sunday from 10am to 3pm.
During these periods there will be fewer firefighters on duty across the country including Hertfordshire.