In a large pitcher, muddle your berries and sugar for about a minute. If you don't have a muddler you can use a wooden spoon.
Add the orange juice and your brandy (or rum) and mix it for another minute. This helps the sugar dissolve.
Add in your red wine and stir well.
Pour over ice, and garnish with more fruit if you'd like.
Notes
I find that this sangria tastes best when it's allowed to rest for a few hours. This gives the flavors a chance to mingle together. It will keep in the refrigerator for up to 2 days.