| Regimental number | 10/3959 |
| Occupation | Bushman |
| Next of kin | Father, Jense Vilhelm Mortensen, Piopio, Te Kuiti |
| Rank on embarkation | Private |
| Unit name | New Zealand Expeditionary Force, 10th Reinforcements, Wellington Infantry Battalion, B Company |
| Embarkation details | Unit embarked from Wellington on |
| Family/military connections | Brothers: 10/623 Ole Peter MORTENSEN; 28171 George Victor MORTENSEN |
| Sources | Nominal Roll Vol. 2: Roll 26, p. 12 |