In December 2013, conflict along tribal lines started in Juba, the capital of South Sudan and soon spread to six of the country's ten states. Unity State's Leer County was badly affected by active conflict at the beginning of 2014. In Leer, the county's capitol, large traders have fled, and the main trade routes are blocked by active conflict and localized flooding. This report presents the results of an EMMA that Mercy Corps conducted in Leer County on the livestock, sorghum and sheep and goat markets, which traditionally provide a means of survival for vulnerable households. It proposes a number of response options designed to support the food security of households in Leer County. Depending on how the conflict evolves over the next few months, it recommends one or more of the following options: direct support to conflict-affected households to access key food items and assets and to diversify income sources; support to a variety of market actors to restore market function and possibly strengthen market systems, including support services; and support to farmers to increase agricultural production.