Today I tried to ignite coal on a grill device, without using kindling (we run out of it). I gathered a lot of small twigs and a bit medium ones. I managed to put this all on fire, but coal didn't get ignited and it was extinguished soon after the twigs were out.
I've observed my grandmother putting coals into fire in oven, but after twigs, she was putting a blocks of wood into fire, so the temperature was quite high. It's not applicable on grill device.
Are there any special techniques of putting coal into fire with the campfire of limited size (such as those on grill device)? Is it possible to achieve with the temperature such small fire can achieve?