Wireless ad-hoc networks are autonomous, self-configurating and adaptive. Thus, such networks are excellent candidates for military tactical networks, where their ability to be operational rapidly and without any centralized entity is essential. As radio coverage is usually limited, multihop routing is often needed; this is achieved by an ad-hoc routing protocol supporting nodes mobility. In this paper, we present performance measurements of the OLSR (Optimized Link State Routing) protocol routing, presented at the IETF MANET (Mobile Ad-hoc NETwork) working group for ad-hoc networks. The measurements are performed at CELAR site on a platform representative of military scenarios in urban areas. It consists of ten routers, eight PDAs and laptops using a IEEE 802.11b radio interface and implementing OLSR v7. Some nodes are mobile within vehicles. The emphasis of the measurements is on the performance of the network (route repair, network convergence speed, user traffic performance) in presence of this mobility.