NABATIYE, Lebanon — The children crowd forward around the glass case, eager for a glimpse of the martyr’s bloodstained clothes. His belt is here, and the shoes he died in, scarred with shrapnel. The battered desk where he planned military operations still has his box of pencils on it, his in-box, his cellphone.

“May God kill the one who killed him,” an old woman says, wiping tears from her eyes as she stares through the glass.

The dead man being shown such veneration is Imad Mugniyah, the shadowy Hezbollah commander. Until his death in a car bombing in Syria in February he was virtually unknown here, his role in the militant Shiite group clothed in secrecy. But since then Hezbollah has hailed him as one of its great military leaders in the struggle against Israel....

The presentation, which opened Aug. 15, is Hezbollah’s most ambitious multimedia exhibit to date, meant to dramatize the group’s bitter conflict with Israel on the second anniversary of their latest war. Schoolchildren pour in throughout the day, absorbing the carefully honed message of heroic resistance.