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How do you subtract a number from a variable in a batch file?

I can't figure out how to make a lives system for my game and I need to know how.

Here is my code for the lives;

SET lives=5

:Scene1
CLS
ECHO  o       Woof!
ECHO /0\   ,###@'
ECHO / \     /   \
ECHO #########################################
ECHO.
ECHO You are walking along the dirt
ECHO road with your backpack and trusty dog Steve.
ECHO You have !lives! lives.
PAUSE
CLS

. . .

:WinFight1

SET /a lives-=1
CLS

ECHO  o
ECHO /0\    ,###@                      w   \__,.  \__,.
ECHO / \      /   \                        3--`~  /--,^  /--,^
ECHO #########################################
ECHO.
ECHO You won the fight!
ECHO You now have !lives! lives.
PAUSE
GOTO Scene2

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I expected it to output 'You have 5 lives.' in the first section, and 'You now have 4 lives.' in the second part, but instead, I got 'You have !lives! lives and 'You now have !live! lives.'

Kyle Abrahams, PMP

SET lives=5

:Scene1
CLS
ECHO  o       Woof!
ECHO /0\   ,###@'
ECHO / \     /   \
ECHO #########################################
ECHO.
ECHO You are walking along the dirt
ECHO road with your backpack and trusty dog Steve.
ECHO You have %lives% lives.
PAUSE
CLS

. . .

:WinFight1

SET /a lives-=1
CLS

ECHO  o
ECHO /0\    ,###@                      w   \__,.  \__,.
ECHO / \      /   \                        3--`~  /--,^  /--,^
ECHO #########################################
ECHO.
ECHO You won the fight!
ECHO You now have %lives% lives.
PAUSE
GOTO Scene2

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ASKER CERTIFIED SOLUTION

Kyle Abrahams, PMP

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