Hezbollah has probably deployed up to 4000 fighters to Syria at any given time. Estimates vary widely, from about 1500-8000, but sources agree this represents a meaningful component of Hezbollah's total manpower. Hezbollah uses short deployments in Syria, around a few weeks to a month. Although Hezbollah has deployed as line infantry on several occasions, most of their involvement is as front-line advisors providing specialized military assistance like communications support, sniper fire, and special forces. The scope of Hezbollah's involvement in Syria, as their largest ever military engagement, is such that they send not just fighters to the country but also support personnel and trainers.