At the start of the First World War he was appointed to supervise roads used by the Allies in France, holding the British Army rank of Brigadier-General.

[2][3][4] In 1884 he joined the Wrexham contracting firm of Johnson Brothers and Slay, where he became manager,[2] and worked on the Glyn Valley Tramway during the rebuilding in 1886.

From 1892 until 1895 he served as the engineer and surveyor of the Ffestiniog Local Highways Board, followed by a similar appointment to the Malvern Urban District Council.

[1][4] He carried out experiments on road surfaces at Sidcup to try to improve durability and reduce dust produced by the increased speed of traffic.

[5] This organisation was absorbed into the British Army later that year and Maybury was placed at the head of the Roads Directorate and commissioned as a brigadier general.

[4] Maybury was mentioned in dispatches four times for his work during the war and was appointed a Companion of the Order of the Bath and an Officer of the Legion of Honour in 1917.

[4] In this role Maybury developed new arterial highways and modernized existing roads, providing a considerable means of employment during a period of depressed economic output.

[3] Maybury also held a number of commercial directorships up to his death, including chairmanship of the British Quarrying Company and trustee of the West Midlands Savings Bank.

He married, secondly, in August 1942, when aged 77, his personal secretary, Katharine Mary, daughter of Samuel William Pring of Winchester, Hampshire.