R – Barplot with 2 variables side by side

I am trying to get a barplot which is fairly common, but despite reading tons of documentation on plotting in R, and the documentation of ggplot and all its layers, I cannot get this plot the way I want it to.

My data is fairly simple.

aov.data
   Block    RTreg    RTrnd
1 Block1   0.0000 862.0707 
2 Block2 667.2081 770.4315 
3 Block3 645.4730 696.0200
4 Block4 674.5200 659.4765
5 Block5 651.4295 633.7333

What I want to get is a barplot with the Block column in the x axis, working as a categorical variable. In the y axis I want to have the values to plot the RTreg and RTrnd columns. This is the part I cannot get right. What I would like is t have two bars per tick mark in the x axis. One bar representing the value of RTreg in that Block, and one bar representing the value of RTrnd in that block. Something like this:

.

But with 5 sets of two bars instead of two.

So far, I have used the following code:

ggplot(aov.data,aes(x=Block)) + 
          geom_bar(aes(y=RTreg),stat="identity",position="dodge",col="blue") +
          geom_bar(position="dodge") +   
          geom_bar(aes(y=RTrnd),stat="identity",position="dodge",col="red")

What I thought I was doing was to first create the base plot with the categorical x axis containing the blocks. Then, with geom_bar I thought I was adding, first, the RTreg column, and with the second geom_bar, that I was adding the RTrnd column. With the option position being equal to dodge I though I was going to get the two bars, side by side. However, the plot I am getting is:

.

Any idea on how to get the two bars side by side, and hopefully with different colors and a legend for each? I would really appreciate some guidance here.

Thanks in advance.