Around 1995, a small group of fighters went to Bosnia to train Muslims in the civil war. This was probably Hezbollah's first expeditionary endeavor. Hezbollah continued to find suicide attacks morally acceptable, but phased their usage out because they were no longer tactically effective; the group launched just four suicide attacks in the 1990s. This is part of the party's long-term trend towards non-terrorism forms of violence. During the 1990s, Hezbollah particularly targeted Shiite conscripts in the SLA for defections, desertion, or intelligence. Along with the organization's use of PSYOPS and propaganda warfare, this led to plummeting morale within the SLA. SLA morale, and even IDF morale, declined as the insurgency went on. Although the insurgency had sometimes seemed "tepid" in the early 1990s, the 1996 Operation Grapes of Wrath greatly increased the level of violence. Hezbollah and Israel engaged in a sixteen-day campaign marked by thousands of rocket and artillery strikes and intensified fighting. Hezbollah launched hundreds of rockets onto Israel during the conflict, and their "rocket performance improved particularly between 1993 and 1996." The campaign ended with the written April Understanding, which established well-understood "rules of the game" and allowed retaliation if either side crossed "red lines," particularly attacks on civilians. Since then, Hezbollah has followed typical strategic doctrine of escalation and deterrence.