Leon Underwood's involvement with the Royal Engineers during World War I had a significant impact on his artistic career. Serving in the Royal Engineers, Underwood was exposed to various technical skills and disciplines, which influenced his approach to art. The experience provided him with a unique perspective on structure, form, and the use of materials, which he later incorporated into his work as a sculptor and painter.

His time in the military likely honed his skills in precision and attention to detail, which are evident in his later works. After the war, Underwood continued to develop his artistic style, blending traditional techniques with modernist influences. This combination of technical skill and innovative thinking helped him establish a distinctive voice in the art world.

Furthermore, the discipline and resilience gained from his military service may have contributed to his ability to experiment with different media and techniques, leading to a diverse and prolific career. Underwood's work often reflected themes of human experience and emotion, possibly influenced by the profound impact of his wartime experiences.

Overall, his service with the Royal Engineers enriched his artistic practice, providing him with skills and perspectives that he carried throughout his career.